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How to clean the throttle body on a 4 cylinder 2AZ-FE Toyota.

The intake must be removed to access the throttle body at the back of the engine bay.

First, the air box and vacuum lines are removed, exposing the air filter. The air intake tube is then removed by loosening hose clamps around the throttle body.

With the ignition in ON, floor the pedal to open the butterfly valve, since this vehicle is drive by wire. Use a toothbrush and throttle body cleaner to clean the carbon deposits in the throttle body. Clean excess cleaner with a rag and replace all components.

The first start on the car will be hard and may require throttle input to burn the cleaner in the intake. If a check engine light illuminates, disconnect the battery for a few minutes to clear the code.

Procedure was shown on a 2003 Toyota Camry 4 cylinder. Same procedure applies to 4 cylinder Rav4, Scion tC, Highlander, Solara and XRS Corolla and Matrix with the 2.4L engine.

Perform a throttle body or idle air control valve cleaning if your car idles and runs rough, won't start, has reduced throttle response or is getting bad fuel economy. Its also a good time to clean out the MAF (mass airflow sensor), PCV valve and change the air filter if it is dirty.

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